About Gigi

Gigi Costanzo is a partner at McGuinty Law Offices with a practice spanning civil litigation and real estate. His litigation work covers personal injury, debt collection, shareholder disputes, insurance claims, mortgage enforcement, construction, and landlord and tenant matters, and he has appeared before the Ontario Superior Court of Justice, the Divisional Court, and Small Claims Court. His real estate practice includes residential and commercial transactions, subdivisions, mortgages, and tenancies, and he has completed more than 4,000 real estate transactions. He has represented a minority shareholder against majority owners, recovered compensation from a negligent lawyer's insurer without litigation, and obtained a court order allowing a dissolved company's property to be sold. He also represented a client catastrophically injured in a car accident, securing a settlement that paid the full insurance policy limits.

Practice areas

Civil Litigation & Dispute Resolution

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This listing was generated by AI from public sources in September 2026. It may contain errors, and we can’t guarantee it’s accurate or complete. Before you rely on anything here, verify it on their firm’s website. Confirm Gigi Costanzo’s licence and standing in the Law Society of Ontario directory ↗

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